Are Gemini's and cancer's compatible

Typically, the only way that Gemini and Cancer would be compatible is if Gemini had other planets in the water element signs (Pisces, Cancer, Scorpio) and Cancer had other planets in the air elements (Aquarius, Gemini, Libra).

True opposites, Gemini is as independent as Cancer is dependent. Gemini faces life events with logic first and emotion second, while Cancer faces life events in the opposite (emotion first, logic second).

There are in excess of 6,000,000,000 people in the world.

There are 12 'star signs'.

There are more than 500,000,000 people on average, for each sign.

Take any two signs. That is 1,000,000,000 people.

There will be many that are compatible and many that are not.